sábado, 21 de diciembre de 2019

Early Release - Non-Leishmania Parasite in Fatal Visceral Leishmaniasis–like Disease, Brazil - Volume 26, Number 2—February 2020 - Emerging Infectious Diseases journal - CDC

Early Release - Non-Leishmania Parasite in Fatal Visceral Leishmaniasis–like Disease, Brazil - Volume 26, Number 2—February 2020 - Emerging Infectious Diseases journal - CDC

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EMERGING INFECTIOUS DISEASES®

Volume 26, Number 2—February 2020
Letter

Non-Leishmania Parasite in Fatal Visceral Leishmaniasis–like Disease, Brazil

To the Editor: We read with interest the recent article describing involvement of Crithidia-related parasites in visceral leishmaniasis (VL) in Brazil (1). In 2010, we published a similar study about the identification of Leptomonas sp., another monoxenous trypanosomatid, among clinical isolates from VL patients in India: of 120 cultured isolates, 111 were typed as L. donovani and 9 as Leptomonas sp. (2). As in the Brazil study, we infected BALB/c mice with 1 Leptomonas isolate; at 45 days postinfection, we found Leptomonas and Leishmania DNA by PCR in the animals’ spleens. Assuming that sterility was preserved during the experiment, we interpreted that original infection in patients resulted from a mixture of the 2 species, Leptomonas overgrew L. donovani in culture because of substantial growth advantage of the former, and a few remaining L. donovani cells in the culture spread in the animals after inoculation because of their higher in vivo fitness.
We suspect a similar phenomenon could have occurred in Brazil, and additional analyses are required to support the authors’ conclusions. Given that mice were inoculated with clinical isolates, postanimal typing should have been done. Furthermore, linking genotyping information of cultivated (cloned) strains with a patient phenotype is risky because of the selection biases of in vitro isolation and maintenance. Using a recently developed method for direct sequencing of L. donovani complex parasites in host tissues, we demonstrated that genotypes of parasites in bone marrow samples differed from derived and cultivated isolates (M.A. Domagalska et al., unpub. data, https://www.biorxiv.org/content/10.1101/676163v1External Link). This result most likely was due to polyclonal L. donovani infections and differences in fitness of different genotypes in vitro and in vivo. On the basis of this evidence, we recommend direct parasite sequencing in clinical samples in future work. If impossible, results based on cultured isolates should be interpreted with caution. We recommend a follow-up study to verify the possibility of Crithidia/Leishmania co-infection and the capacity of Crithidia to cause leishmaniasis-like disease as a single infection.
Malgorzata Anna DomagalskaComments to Author  and Jean-Claude DujardinComments to Author 
Author affiliations: Institute of Tropical Medicine, Antwerp, Belgium

References

  1. Maruyama  SRde Santana  AKMTakamiya  NTTakahashi  TYRogerio  LAOliveira  CABet al. Non-Leishmania parasite in fatal visceral leishmaniasis–like disease, Brazil. Emerg Infect Dis2019;25:208892DOIExternal LinkPubMedExternal Link
  2. Srivastava  PPrajapati  VKVanaerschot  MVan der Auwera  GDujardin  JCSundar  SDetection of Leptomonas sp. parasites in clinical isolates of Kala-azar patients from India. Infect Genet Evol2010;10:114550DOIExternal LinkPubMedExternal Link
Suggested citation for this article: Domagalska MA, Dujardin JC. Non-Leishmania parasite in fatal visceral leishmaniasis–like disease, Brazil. Emerg Infect Dis. 2020 Feb [date cited]. https://doi.org/10.3201/eid2602.191428
DOI: 10.3201/eid2602.191428


Original Publication Date: 12/19/2019

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